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Yeonhwa Choi, a seemingly ordinary student, is secretly living a double life as an undercover agent. When the agency she works for receives a suspicious blackmail letter threatening a series of bomb attacks, she’s assigned to investigate. Sent undercover to one of the nation’s most elite high schools, Yeonhwa soon realizes there’s far more hidden beneath the surface than she expected. In a world filled with secrets, danger, and shifting alliances, will she fail or prevail?